Lucio Demare was an Argentinian musician, a tango and film composer and orchestra director.
Argentina, 1915. Accompanied by a doctor and his beautiful daughter, Köhner, a ruthless foreman who rules a yerba mate plantation with an iron fist, arrives in the city of Posadas with the purpose of hiring workers.
In a fort in the middle of the Pampa, their commander Hilario Castro decides to bring women from Buenos Aires, for deserting soldiers.
The story of the irregular forces on the north of Argentina, fighting against the Spanish Crown for the independence.